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5/31 MCQs for:

Kinematics in one dimension

Suppose that an object is moving with constant acceleration. Make a statement concerning its motion with respect to time.

In equal times its velocity changes by equal amounts.

In equal times its speed increases by equal amounts.

A statement cannot be made using the information given.

In equal times it moves equal distances.

Suppose a ball is thrown straight up. Make a statement about the velocity and the acceleration when the ball reaches the highest point.

Neither its velocity nor its acceleration is zero.

Its velocity is not zero and its acceleration is zero.

Both its velocity and its acceleration are zero.

Its velocity is zero and its acceleration is not zero.

A ball is thrown vertically upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

1.7:1.

1.4:1.

2:1.

4:1.

Can an object have increasing speed while its acceleration is decreasing? Support your answer with an example.

Yes, and an example would be an object released from rest in the presence of air friction.

Yes, and an example would be an object falling in the absence of air friction.

No, this is impossible because of the way in which acceleration is defined.

No, because if acceleration is decreasing the object will be slowing down.

A brick is dropped from the top of a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

The first brick accelerates faster.

The second brick accelerates faster.

The two bricks accelerate at the same rate.

It is impossible to determine from the information given.